Caching on GHES (#452)

* add support for ghes caching

* fix licesnses

* work on resolving comments

* change internal error to warning

* fix warning for internal errors

* update version

src/cache-utils.ts

@@ -1,5 +1,6 @@
 import * as core from '@actions/core';
 import * as exec from '@actions/exec';
+import * as cache from '@actions/cache';
 
 type SupportedPackageManagers = {
   [prop: string]: PackageManagerInfo;
@@ -95,3 +96,28 @@ export const getCacheDirectoryPath = async (
 
   return stdOut;
 };
+
+export function isGhes(): boolean {
+  const ghUrl = new URL(
+    process.env['GITHUB_SERVER_URL'] || 'https://github.com'
+  );
+  return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
+}
+
+export function isCacheFeatureAvailable(): boolean {
+  if (!cache.isFeatureAvailable()) {
+    if (isGhes()) {
+      throw new Error(
+        'Cache action is only supported on GHES version >= 3.5. If you are on version >=3.5 Please check with GHES admin if Actions cache service is enabled or not.'
+      );
+    } else {
+      core.warning(
+        'The runner was not able to contact the cache service. Caching will be skipped'
+      );
+    }
+
+    return false;
+  }
+
+  return true;
+}

src/main.ts

@@ -4,7 +4,7 @@ import fs from 'fs';
 import * as auth from './authutil';
 import * as path from 'path';
 import {restoreCache} from './cache-restore';
-import {URL} from 'url';
+import {isGhes, isCacheFeatureAvailable} from './cache-utils';
 import os = require('os');
 
 export async function run() {
@@ -45,10 +45,7 @@ export async function run() {
       auth.configAuthentication(registryUrl, alwaysAuth);
     }
 
-    if (cache) {
-      if (isGhes()) {
-        throw new Error('Caching is not supported on GHES');
-      }
+    if (cache && isCacheFeatureAvailable()) {
       const cacheDependencyPath = core.getInput('cache-dependency-path');
       await restoreCache(cache, cacheDependencyPath);
     }
@@ -66,13 +63,6 @@ export async function run() {
   }
 }
 
-function isGhes(): boolean {
-  const ghUrl = new URL(
-    process.env['GITHUB_SERVER_URL'] || 'https://github.com'
-  );
-  return ghUrl.hostname.toUpperCase() !== 'GITHUB.COM';
-}
-
 function resolveVersionInput(): string {
   let version = core.getInput('node-version');
   const versionFileInput = core.getInput('node-version-file');